Mechanism for driving a part at variable speed.



G. SPIESS. MECHANISM FOR DRIVING A PART AT'VARIABLE SPEED. APPLIOATION FILED ILB.6, 1911.

1,046,504, Patented Dec. 10, 1912.

COLUMBIA PLANOURAPH (JO-,WASHINGTON. D. c.

finally rest against the stop D. For drivsheets thus will stow or creep upon the stop.

UNITED STATES PATENT @FFIQE.

GEORG SPIESS; OF LEIPZIG-ANGER-CROTTENIDORF, GERMANY.

MECHANISM FOR DRIVING A PART AT VARIABLE SPEED.

Patented Dec. 10, 1912. Serial No. 606,964.

Specification of Letters Patent. Application filed February 6, 1911.

trically attached to the driving wheel H so that its pitch circle goes approximately through the axis of the shaft I of said driving wheel. By'virtue of this arrangement I attain that with each revolution of the shaft I the chain operated mechanism imparts to the delivery apparatus first, a uniformly retarded motion until it comes to a standstill for a moment and then it imparts a uniformly accelerated motion. This retardation and acceleration in the movement of the delivery apparatus is effected by the eccentrically mounted sprocket wheel E. The sheet conducted onto and over the driving roll A and the apron C is accordingly transported with gradually retarded speed toward the stop D and reaches the latter at the time when the apron is practically at rest for a moment. In this way the desired exact location of each single transported sheet is assured.

A modified form of device represented in Fig. 2 shows the driven sprocket wheel F secured to a movable lever K and both sprocket wheels are connected by means of an arm L movably connected thereto. By means of this arrangement the sprocket chain may remain uniformly tensioned during the entire eccentric rotary motion of the sprocket wheel E as may be seen from its position shown in dotted lines in Fig. 2. The rotary mot-ion of the chain operated mechanism in this modified form is transmitted from the shaft of the sprocket wheel F to the rolls of the apron by means of the tooth wheels M, N and O.

I claim as my invention:

1. Mechanism for driving intermittingly a part at variable speed, comprising a shaft with a driving wheel, two sprocket wheels, and a chain for connecting said sprockets, one sprocket wheel being eccentrically mounted on said driving wheel so that its pitch circle passes approximately through the axis of the shaft of the same whereby during each revolution a uniformly retarded and accelerated motion is imparted to the sprocket chain and thus to the second sprocket and the mechanism operated thereby.

2. Mechanism for driving intermittingly a part at variable speed, comprising a shaft with a driving wheel, two sprocket wheels, and a chain connecting the said sprockets, one sprocket being eccentrically attached to said driving wheel so that its pitch circle To all whom it may concern:

Be it known that I, Gnone Srmss, a citizen of the Empire of Germany, and a resident of Leipzig-Anger-Crottendorf, Germany, have invented certain new and use ful Improvements in Mechanism for Driving a Part at Variable Speed, of which the following is a specification.

This invention has reference to improvements in mechanism for driving a part at a variable speed whereby during each revolution of a certain shaft a uniformly retarded mot-ion of said part is effected until it comes to a standstill for a moment and then acquires a uniformly accelerated motion. This mechanism is particularly adapted for a novel driving device for delivery apparatus in sheet feeders.

The sheets which are singly carried forward by the feed mechanism are guided on a transport or delivery apparatus for the purpose of being further worked up. The rapid forward movement of the sheets by the delivery apparatus causes said sheets to abut with great speed against the stop which is located at the end of same. The

In order to avoid the described deficiencies, the delivery apparatus receives a retarded motion. This is accomplished according to the present invention by driving the delivery apparatus by means of a chain operated device whose driving sprocket wheel is eccentrically mounted on the driving wheel so that its pitch circle passes approximately through the center of the shaft of said driving wheel.

The invention is illustrated in the accompanying drawing in which:

Figure 1 represents diagrammatically an arrangement of a driving device embodying in desirable form the present improvements, and Fig. 2 shows a modified form of same.

The delivery apparatus consists of the driving rolls A, B which are adapted to receive a transporting apron C. The single sheets conducted onto said apron shall ing the rolls A, a chain operated device is provided consisting of the sprocket wheels E, F and the sprocket chain G. The driving sprocket wheel E is eccentrically mounted upon the driving tooth wheel H or upon an arm secured to the shaft I of said tooth wheel H. In accordance with the present invention the sprocket wheel E is eccenpasses approximately through the axis of a second sprocket Wheel, and a sprocket 15 the shaft of the same whereby during each chain connecting both so that upon each revrevolution a uniformly retarded and acolution of the driving Wheel a uniformly celerated motion is imparted to the sprocket retarded and accelerated motion is imparted chain and thus to the second sprocket and to the sprocket chain and thus to the secthe mechanism operated thereby leaving the 0nd sprocket and the mechanism operated 20 latter practically at rest for a moment durthereby leaving the latter at rest for a moing each cycle of operations. ment during each cycle of operations.

3. In driving mechanism for driving in- Signed at Leipzig, Germany, this 5th termittingly a part at variable speed, a day of December 1910. shaft with a driving Wheel, a sprocket Wheel 7 GEOR-G SPIESS. eccentrically attached to said driving Wheel Witnesses: so that its pitch circle passes approximately RUDOLPH FRIOKE, through the axis of the shaft of the same, EDWARD SoHRoDnR.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

